This paper systematically studied a long span steel truss continuous railway bridge,which is a practical engineering,and built a 3D finite element model for this bridge within the environment of SAP2000.A non-linear dynamic time-history analysis method was conducted to investigate the control effectiveness of the installed viscous dampers upon this long span continuous steel truss girder railway bridge.Parameter optimization of viscous dampers is carried out to economically improve the performance of the railway bridge.The research results show that the displacement of girder and the internal force responses of pier bottom of the bridge can be reduced significantly by fluid viscous dampers on condition that the fluid viscous devices are of optimal placement and parameters,thus greatly enhance the safety of the high pier large span steel truss continuous bridge under rare earthquakes.%以某大跨度的铁路钢桁架连续梁桥为工程背景,基于有限元软件SAP2000建立其三维有限元模型,采用非线性动力时程分析方法分析了在罕遇地震作用下黏滞阻尼器对大跨度高墩连续钢桁架梁桥的减震效果,研究了黏滞阻尼器参数对减震效果的影响规律.研究结果表明:通过对黏滞阻尼器的合理布置和参数优化可以有效减小大跨铁路桥梁的主梁位移和墩底内力,显著改善其强震下的抗震性能.
展开▼
